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FIRE AND SMOKE PROTECTION FEATURES

TABLE 721.1(3)—continued
MINIMUM PROTECTION FOR FLOOR AND ROOF SYSTEMS a, q
THICKNESS OF FLOOR MINIMUM THICKNESS OF
OR ROOF SLAB CEILING
FLOOR OR ROOF ITEM CEILING CONSTRUCTION (inches) (inches)
CONSTRUCTION NUMBER
4 3 2 1 4 3 2 1
hours hours hours hour hours hours hours hour
17. Perlite concrete
slab proportioned
1:6 (Portland cement
to perlite aggregate) Perlite gypsum plaster on metal lath wire tied to / " furring
3
4
on a / "-deep steel 17-1.1 channels attached with 0.065" (No. 16 B.W. gage) wire ties — 2 p 2 p — — 7 / 8 3 / 4 —
9
16
deck supported by to lower chord of joists.
steel joists 4 on
center. Class A or B
roof covering on top.
18. Perlite concrete
slab proportioned
1:6 (Portland cement
to perlite aggregate)
on 1 / " -deep steel
1
4
deck supported on
individually
protected steel
framing. Maximum
span of deck 6-10"
where deck is less
than 0.019" (No. 26 18-1.1 None — 2 / 2 / — — — — —
1 p
1 p
carbon sheet steel 4 4
gage) and 8-0"
where deck is 0.019"
(No. 26 carbon sheet
steel gage) or
greater. Slab
reinforced with
0.042" (No. 19 B.W.
gage) hexagonal
wire mesh. Class A
or B roof covering
on top.
19. Floor and beam
construction
consisting of 3" - Suspended envelope ceiling of perlite gypsum plaster on
deep cellular steel metal lath attached to / " cold-rolled channels, secured to
3
floor unit mounted 1 / " cold-rolled channels spaced 42" on center supported
4
1
on steel members 19-1.1 by 0.203 inch (No. 6 B.W. gage) wire 36" on center. Beams 2 p — — — 1 l — — —
2
with 1:4 (proportion in envelope with 3" minimum airspace between beam soffit
of Portland cement and lath have a 4-hour rating.
to perlite aggregate)
perlite-concrete
floor slab on top.
(continued)

176 2018 INTERNATIONAL BUILDING CODE ®
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